I reckon that the way online porn pushed payment and video tech mainstream.
Darknet usage of crypto will really test decentralisation and privacy more than any of the legal use cases.
Dropgangs, or the future of darknet markets • Opaque Link
radical candour from a deep generalist
Dreampipe's Blog 
There is an interesting podcast on darknet about Alphabay.
https://www.google.com/podcasts?feed=aHR0cHM6Ly9kYXJrbmV0ZGlhcmllcy5jb20vcG9kY2FzdC54bWw&episode=aHR0cHM6Ly9kYXJrbmV0ZGlhcmllcy5jb20vcG9kY2FzdHMvZGFya25ldC1kaWFyaWVzLWVwMjQtYmF5b25ldC5tcDM
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